Thumb-screw.



O. ZERK.

THUMB SCREW.

APPLICATION FILED APR. 3, 1913.

1,094,768. Patented Apr. 28, 1914.

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fle 2 525 UNITED STATES PATENT onrion.

OSCAR ZERK, OF CLEVELAND, OHIO, ASSIGNOR, BY MESNE.ASSIGNMENTS, TO GECRGE W. BOWEN, OF AUBURN, NEW YORK.

THUMB- SCREW.

Patented Apr.-28, 1914 Application filed April 3, 1913. Serial No. 758,553.

To all whom it may concern:

Be it known thatl, OSCAR ZERK, a subject of the Emperor of Austria-Hungary, residing at Cleveland, in the county of Guyahoga and State of Ohio, have invented a certain new and useful Improvement in Thumb- Screws, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

The object of this invention is to provide a very simple and effective thumb screw, in which the head may be made by stamping from sheet metal, and the screw ma be formed in any suitable manner, the hea being rigidly secured on the shank of the screw.

My invention is hereinafter more fully described and its essential characteristics set out in the claims.

In the drawings, Figure l is a central side elevation partly in section of my thumb screw; Fig. 2 is a plan of the blank from which the head of the thumb screw is made; Fig. 3 is a section through a pair of dies for converting the blank into a trough-shaped member, the being shown in section in this view; Fig. 4 is a cross section throughthe lower die of Fig. 3 and illustrating also the troughshaped member being stamped; Fig. 5 is a perspective view of such trough-shaped member; Fig. 6 is a vertical section of the next set of dies and a section of the troughshaped member being stamped thereby; Fig. 7 is a perspective view of the product of the dies shown in Fig. (3. Fig. 7 shows the head ready to be mounted on the shank of the' screw.

As shown in Fig. 1, A represents the head of the screw, B the screw proper, and G a piece of metal in which the screw is journaled. The screw is shown as having a collar I) below the member C and a cylindrical shank 72' extending through the member and occupying a tubular portion of the head A. The finished head is substantially of the form shOWn in inverted position in Fig. 7 It has the two doublecltogether portions 41, and the tubular portions a extended at a bevond the edges of the side portions.

The head having the form just described is made by stamping from a suitable blank,

such as shown at A in tan ular blank, except that it has a pair of pro1ecting short wings A bottom portion of the trough.

Fig. 2, being :1 rec- I This blanlris placed between dies shown in Fig. 3. The die here shown as the upper die has a rib D rounded at its lower edge and intermediately provided with vertical rounded bosses D The die E is a female correspondingly formed. The blank is placed between these two, and, by reason of the coaction of the d185, is pressed into the trough-shaped form shown in Fig. 5 with the outward bosses A on the two side portions. The trough shaped member, as shown in Fig. 5, isthen placed between the two dies F and F'and a sultable stud or mandrel G is placed between the bosses A The pressure of the dies F and Ftow'ard each other presses the troughshaped wings onto each other and'presses the trough-shaped bosses into semi-circular form about the mandrel G, the blank thus taking the form shown in Fig. 7. The head having the form shown in Fig. 7 is placed over the shank b of thescrew and secured thereto in any suitable manner, as, "for example, bythe drilling of the hole through the head and shank and driving into such hole the pin H. 'When the head is mounted on the thumb screw it has the appearance and operation of a head machined from a single bar. The line between the two sides of the metal plate of which the head is formed is emphasized in Fig. 7 for clearness of illustration. In practice it is hardly noticeable and disappears altogether when the head is plated. By making the head and screw separable, the screw may be rotatably mounted in an intermediate member, as shown in Fig. 1. "In that case the extension a of the tubular portion of the head furnishes a suitable collar for taking the thrust against that side of the intermediate member, the rigid collar on the screw taking the opposite thrust.

Having thus described my invention, what I claim is:

1. A thumb screw consisting. of a stem portion threaded at one end, and a head or handle formed from a blank of sheet metal doubled upon itself to provide corresponding sides and a connecting portion, the latter being located substantially in alinement with the axis of the stem, and the sides embracing opposite sides of the stem, and means for rigidly connecting the head to the stem, substantially as and for the purpose described.

A thumb screw consisting of a stem havin a threaded portion, a head or handle forrne from a blank of sheet metal and comprising corresponding sides and a connecting portion, said sides having corresponding arcuate portions forming a socket, one end of the stem being inserted in said socket and said. connecting portion extending transversely across the extremity of said end, and means for connecting the head to the stem, substantially as and for the purpose specified.

3. A thumb screw comprising a stem having a threaded portion, a sheet metal head provided with corresponding sides and a connecting portion, said sides having arcuate portions intermediate their ends and the parts of one side between'the arcuate portion and the ends thereof being pressed into intimate contact with the corresponding portions of the other side, and one end of the stem being inserted between the arcuate portions of t e two sides, said connecting portion of the head extending transversely across the extreme end of the stem, and means for connecti the head to the stem, substantially as anv for the purpose set or hthumb screw consisting of a stem threaded at one end, and a head or handle formed from sheet metal and comprising corresponding sides and a connecting portion,l'the latter extending across one end of the stem, and the sides of the head extending in planes parallel to the longer axis of the stem, said head being provided with a socket for receiving the end of the stem, the walls of the socket being formed by deflect ed portions of the sides, substantially as and for the purpose described.

5. A thumb screw consistin of a sheet metal blank, bent into a troug -shape with arcual externally convex transverse bosses on its opposite sides, the side portions betweenthe bosses and therendsbeing pressed together, the shank of a screw being mounted in the intermediate recess which is left.

6. A thumb screw consisting of a substantially rectangular blank with short wings on its opposite sides, doubled intermediately into a trough-shape with transverse arcual bosses terminatin in the wings, the side portions beyond the bosses being pressed together, whereby a head is provided having a tubular central portion with projecting flat extensions, the tubular portion proj eoting beyond the edge of the extensions, and there being secured in such tubular portion a suitable shank of a screw.

In testimony whereof, I hereunto afiix my signature in the presence. oi? two witnesses.

' osoAn ansx.

Witnesses:

JUSTIN W. MACKLIN, BRENNAN B. WEST. 

